texashuntingforum.com logo
Main Menu
Advertisement
Affiliates
Advertisement
Newest Members
Wyohunter1, BMB163, harkm, Turtle Jeep, ShaneA
64367 Registered Users
Top Posters(All Time)
dogcatcher 90,170
stxranchman 53,759
bill oxner 49,809
RKHarm24 44,577
rifleman 44,414
BMD 41,009
SnakeWrangler 39,576
Big Orn 37,484
txshntr 35,378
Facebook
Forum Statistics
Forums45
Topics417,975
Posts6,076,440
Members64,367
Most Online16,728
Mar 25th, 2012
Print Thread
trim length #7050960
01/24/18 02:03 PM
01/24/18 02:03 PM
Joined: Dec 2011
Posts: 1,093
Ft. Worth
G
garyrapp55 Online content OP
Pro Tracker
garyrapp55  Online Content OP
Pro Tracker
G

Joined: Dec 2011
Posts: 1,093
Ft. Worth
Last night I had to stay up til 10 because I'm on-call this week so I was prepping some cases. I measured length and these cases were varying as much as .006 and were all the same before last loading. Is this normal after resizing?

Re: trim length [Re: garyrapp55] #7050981
01/24/18 02:24 PM
01/24/18 02:24 PM
Joined: Sep 2009
Posts: 13,904
Lewisville, TX
C
ChadTRG42 Offline
THF Celebrity
ChadTRG42  Offline
THF Celebrity
C

Joined: Sep 2009
Posts: 13,904
Lewisville, TX
Yes. .006" is fine for a little variation. As you shoot and resize, some cases will expand more than others. That's fine. With good case prep and consistent powder charges, .006" won't cause any issues what so ever.



Custom and Precision Ammunition!!
www.DallasReloads.com
Type 01 and Type 06 FFL
Re: trim length [Re: garyrapp55] #7051008
01/24/18 02:40 PM
01/24/18 02:40 PM
Joined: Dec 2011
Posts: 1,093
Ft. Worth
G
garyrapp55 Online content OP
Pro Tracker
garyrapp55  Online Content OP
Pro Tracker
G

Joined: Dec 2011
Posts: 1,093
Ft. Worth
So for 308 anything between 2.005-2.015 is good to go, or should there be a maximum accepted variation?

Re: trim length [Re: garyrapp55] #7051011
01/24/18 02:42 PM
01/24/18 02:42 PM
Joined: Oct 2004
Posts: 28,708
Texas
R
redchevy Online content
THF Celebrity
redchevy  Online Content
THF Celebrity
R

Joined: Oct 2004
Posts: 28,708
Texas
Would it matter what they are for? I wouldn't worry about it for uncrimped ammo, but is that enough variation to give you any issues with calibers that head space off of the case mouth like 9mm etc.? or enough variation to mess with crimping/roll crimping? If I'm crimping I always trim cases.


It's hell eatin em live
Re: trim length [Re: garyrapp55] #7051126
01/24/18 04:03 PM
01/24/18 04:03 PM
Joined: Sep 2009
Posts: 13,904
Lewisville, TX
C
ChadTRG42 Offline
THF Celebrity
ChadTRG42  Offline
THF Celebrity
C

Joined: Sep 2009
Posts: 13,904
Lewisville, TX
Originally Posted By: garyrapp55
So for 308 anything between 2.005-2.015 is good to go, or should there be a maximum accepted variation?


308 Win has a "book" max of 2.015" case length. I have let my personal 308 ammo go to 2.025" and load it and shoot it. It will still chamber and shoot good. But after about .010" longer than max length, you will run into chambering issues/problems. If the brass is too long, then when chambering, you essentially are squeezing the case mouth at the chamber and acting like a self crimp inside the chamber. This would be bad and cause some issues.

If you want to keep everything consistent, then you can trim them to all the same length (2.005"). For even my competition ammo, I will have some variance in the case neck lengths, and I don't really care that there is a slight variation. A consistent powder charge and bullet seating depth are the most important to me. I'm not worried about a .005" variation in case length, as long as I'm under the max length. But if it's over the max length by .010" or more, I'll start to worry and trim them back.



Custom and Precision Ammunition!!
www.DallasReloads.com
Type 01 and Type 06 FFL
Re: trim length [Re: redchevy] #7051135
01/24/18 04:07 PM
01/24/18 04:07 PM
Joined: Sep 2009
Posts: 13,904
Lewisville, TX
C
ChadTRG42 Offline
THF Celebrity
ChadTRG42  Offline
THF Celebrity
C

Joined: Sep 2009
Posts: 13,904
Lewisville, TX
Originally Posted By: redchevy
Would it matter what they are for? I wouldn't worry about it for uncrimped ammo, but is that enough variation to give you any issues with calibers that head space off of the case mouth like 9mm etc.? or enough variation to mess with crimping/roll crimping? If I'm crimping I always trim cases.


Yes, it would matter. If you roll crimp (like for a bottlenecked round, 308, 223, etc), a varying case length will cause varying amounts of crimp, which will effect your pressures from round to round, and will have inconsistent ammo. If you have a round like the 9mm or 40 cal that head space off the case mouth, I taper crimp these. This will still crimp but allow less variation from round to round with a varying case length. I load tons of mixed head stamp brass for 40 cal for my personal ammo. I don't worry about case length and crimping since I taper crimp them.

I use a Lee crimp die that squeezes the neck for a crimp, which will allow for a varying case neck length and not have a big issue with varying crimp tension. So, I change up what crimp method I use to account for the variations.



Custom and Precision Ammunition!!
www.DallasReloads.com
Type 01 and Type 06 FFL
Re: trim length [Re: ChadTRG42] #7051167
01/24/18 04:20 PM
01/24/18 04:20 PM
Joined: Dec 2011
Posts: 1,093
Ft. Worth
G
garyrapp55 Online content OP
Pro Tracker
garyrapp55  Online Content OP
Pro Tracker
G

Joined: Dec 2011
Posts: 1,093
Ft. Worth
Originally Posted By: ChadTRG42
Originally Posted By: garyrapp55
So for 308 anything between 2.005-2.015 is good to go, or should there be a maximum accepted variation?


308 Win has a "book" max of 2.015" case length. I have let my personal 308 ammo go to 2.025" and load it and shoot it. It will still chamber and shoot good. But after about .010" longer than max length, you will run into chambering issues/problems. If the brass is too long, then when chambering, you essentially are squeezing the case mouth at the chamber and acting like a self crimp inside the chamber. This would be bad and cause some issues.

If you want to keep everything consistent, then you can trim them to all the same length (2.005"). For even my competition ammo, I will have some variance in the case neck lengths, and I don't really care that there is a slight variation. A consistent powder charge and bullet seating depth are the most important to me. I'm not worried about a .005" variation in case length, as long as I'm under the max length. But if it's over the max length by .010" or more, I'll start to worry and trim them back.


Thanks for the advise. I'll keep em all between 2.005-2.015 and accept a max variation of .01"

Previous Thread
Index
Next Thread


© 2004-2019 OUTDOOR SITES NETWORK all rights reserved USA and Worldwide
UBB.threads™ 7.6.2